CVE-2015-2857

published 2017-08-22

CVE-2015-2857: Accellion File Transfer Appliance before FTA_9_11_210 allows remote attackers to execute arbitrary code via shell metacharacters in the oauth_token parameter.

Priority P1 82 critical 9.8 CVSS 3.1

AV N AC L PR N UI N S U C H I H A H

EXPLOIT

Accellion File Transfer Appliance before FTA_9_11_210 allows remote attackers to execute arbitrary code via shell metacharacters in the oauth_token parameter.

Affected

1 ranges

Vendor	Product	Version range	Fixed in
accellion	file_transfer_appliance	<= 9_11_200	—

Detection & IOCs extracted from sources · hover to see the quote

url /tws/getStatus↗

url /seos/find.api↗

url /seos/put.api↗

url /seos/mput.api↗

command ';#{payload.encoded};echo '↗

port 443↗

path /opt/bin/perl /home/seos/system/call_webservice.pl↗

• → Detect POST requests to /tws/getStatus, /seos/find.api, /seos/put.api, or /seos/mput.api containing shell metacharacters (e.g., single quotes and semicolons) in the oauth_token parameter. ↗
• → Look for POST requests to /tws/getStatus with an oauth_token value matching the pattern ';...;echo ' as the injection payload wrapper. ↗
• → A successful exploitation attempt returns HTTP 200 with JSON body containing '"result_msg":"Success","transaction_id":"'; alert on this response to a request with a malformed/injected oauth_token. ↗
• → A probe/check request sends oauth_token=invalid and expects '"result_msg":"MD5 token is invalid"'; subsequent injection attempt with metacharacters returning Success indicates a vulnerable host. ↗
• → Monitor execution of /opt/bin/perl /home/seos/system/call_webservice.pl with unexpected arguments or child processes, which indicates successful exploitation of the oauth_token injection. ↗

• · The exploit targets port 443 with SSL enabled by default; detection rules should account for HTTPS traffic and may require SSL inspection to inspect the oauth_token POST parameter. ↗
• · The vulnerability was confirmed on FTA_9_11_200 but may affect earlier versions; detection should not be scoped only to that specific version. ↗
• · Multiple endpoints are vulnerable beyond /tws/getStatus; detection coverage must include /seos/find.api, /seos/put.api, and /seos/mput.api. ↗

CVSS provenance

nvd v3.1 9.8 CRITICAL CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

nvd v2.0 7.5 HIGH AV:N/AC:L/Au:N/C:P/I:P/A:P

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